The utility model belongs to the technical field of underwater concreting construction, and particularly discloses a movable conduit end plug for underwater concreting, which solves the problems of longer time consumption for conduit insertion for pumping in consequent working procedure during large-area underwater concreting, and influence on concrete compactness. The movable conduit end plug for underwater concreting comprises a steel pipe capable of being inserted into a conduit, the outer diameter of the steel pipe is consistent with the inner diameter of the conduit, an S clip for fixing the steel pipe is arranged on the upper portion of the inner wall of the steel pipe, a plug steel plate capable of thoroughly covering a conduit end is arranged at the lower end of the steel pipe, a hook is arranged on the plug steel plate, and an anti-drag conical head is arranged on the lower portion of the plug steel plate. The movable conduit end plug for underwater concreting has the advantages that the movable conduit end plug is simple in manufacturing and convenient in construction, simplifies conduit insertion procedure during underwater concreting, saves operation time, and improves efficiency. In addition, the conduit in a full-sealed structure eliminates influence of underwater sediment and accumulated water in the conduit on concrete compactness, and guarantees construction quality.